|Table of Contents|

Study on flexural capacity of damaged recycled aggregate concrete beams strengthened with CFRP sheets(PDF)

《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

Issue:
2024年05期
Page:
113-122
Research Field:
建筑材料
Publishing date:

Info

Title:
Study on flexural capacity of damaged recycled aggregate concrete beams strengthened with CFRP sheets
Author(s):
YAN Yongdong;  WU Keke;  LU Chunhua;  LIANG Xiaofeng;  JI Guangqian
(Faculty of Civil Engineering and Mechanics, Jiangsu University, Zhenjiang 212003, Jiangsu, China)
Keywords:
recycled aggregate concrete beam;  CFRP sheet;  replacement rate of recycled aggregate;  flexural capacity
PACS:
TU375.1
DOI:
10.19815/j.jace.2022.09023
Abstract:
In order to investigate the flexural performance of recycled aggregate concrete(RAC)beams which were damaged by load and then reinforced with carbon fiber reinforced polymer(CFRP)sheets, 9 RAC beams were designed by selecting different replacement rates of recycled aggregate. The initial damage of test beam was obtained by preloading. After unloading, CFRP sheets of different widths were pasted at the bottom of the damaged beam for reinforcement, and then bending bearing capacity tests were conducted on the test beam. Considering the influence of recycled aggregate content and pre-damage degree, a formula for calculating the flexural capacity of the damaged recycled concrete beam strengthened by CFRP sheet during delamination failure was proposed. The results show that the cracks caused by pre-damage reduces the bonding strength between CFRP sheets and RAC beams, and the reinforced beams all exhibit debonding failure. As the replacement rate of recycled aggregate increases, the width and number of cracks generated by the test beam under the same load gradually increase, and the ultimate bearing capacity decreases.As the width of CFRP sheet increases, the deflection during the failure of test beam decreases, the ultimate bearing capacity increases, and the crack distribution is fine and dense. As the degree of pre-damage increases, the crack width and number during the failure of test beam gradually increase, but the changes in ultimate bearing capacity and deflection are not significant. The calculated bending bearing capacity values are in good agreement with the experimental values. The research results can provide reference for the evaluation of the mechanical performance of damaged RAC beams strengthened with CFRP sheets.

References:

[1] 肖建庄.再生混凝土[M].北京:中国建筑工业出版社,2008.
XIAO Jianzhuang.Recycled concrete[M].Beijing:China Architecture & Building Press,2008.
[2]LE H B,BUI Q B.Recycled aggregate concretes — a state-of-the-art from the microstructure to the structural performance[J].Construction and Building Materials,2020,257:119522.
[3]GUO H,SHI C J,GUAN X M,et al.Durability of recycled aggregate concrete — a review[J].Cement and Concrete Composites,2018,89:251-259.
[4]KIM J.Influence of quality of recycled aggregates on the mechanical properties of recycled aggregate concretes:an overview[J].Construction and Building Materials,2022,328:127071.
[5]鲍玖文,于子浩,张 鹏,等.再生粗骨料混凝土及其构件抗冻性能研究进展[J].建筑结构学报,2022,43(4):142-157.
BAO Jiuwen,YU Zihao,ZHANG Peng,et al.Review on frost resistance property of recycled coarse aggregate concrete and its structural components[J].Journal of Building Structures,2022,43(4):142-157.
[6]RUSSO N,LOLLINI F.Effect of carbonated recycled coarse aggregates on the mechanical and durability properties of concrete[J].Journal of Building Engineering,2022,51:104290.
[7]曹万林,赵羽习,叶涛萍.再生混凝土结构长期工作性能研究进展[J].哈尔滨工业大学学报,2019,51(6):1-17.
CAO Wanlin,ZHAO Yuxi,YE Taoping.A review of recent advances in the long-term working characteristic of recycled concrete structure[J].Journal of Harbin Institute of Technology,2019,51(6):1-17.
[8]SONG L,HOU J.Fatigue assessment model of corroded RC beams strengthened with prestressed CFRP sheets[J].International Journal of Concrete Structures and Materials,2017,11(2):247-259.
[9]ELJUFOUT T,TOUTANJI H,AL-QARALLEH M.Effect of CFRP strengthening systems on the fatigue limit of reinforced concrete beams[J].Structure and Infrastructure Engineering,2021,17(3):361-378.
[10]DO-DAI T,CHU-VAN T,TRAN D T,et al.Efficacy of CFRP/BFRP laminates in flexurally strengthening of concrete beams with corroded reinforcement[J].Journal of Building Engineering,2022,53:104606.
[11]HONG S,PARK S K.Effect of bonded lengths and wrappings on energy capacity and debonding strain of reinforced concrete beams strengthened with carbon-fiber-reinforced polymer[J].Polymer Composites,2017,38(7):1418-1426.
[12]丁 智,张 霄,吴云双,等.碳纤维布与芳纶布加固钢筋混凝土梁受弯性能试验研究[J].建筑结构学报,2015,36(增2):270-276.
DING Zhi,ZHANG Xiao,WU Yunshuang,et al.Experimental study on bending behavior of RC beams strengthened with CFRP sheets and AFRP sheets[J].Journal of Building Structures,2015,36(S2):270-276.
[13]HUANG X X,SUI L L,XING F,et al.Reliability assessment for flexural FRP-strengthened reinforced concrete beams based on importance sampling[J].Composites Part B:Engineering,2019,156:378-398.
[14]GOTAME M,FRANKLIN C L,BLOMFORS M,et al.Finite element analyses of FRP-strengthened concrete beams with corroded reinforcement[J].Engineering Structures,2022,257:114007.
[15]JAFARZADEH H,NEMATZADEH M.Flexural strengthening of fire-damaged GFRP-reinforced concrete beams using CFRP sheet:experimental and analytical study[J].Composite Structures,2022,288:115378.
[16]李 翔,顾祥林.碳纤维布加固低强度混凝土梁的抗弯承载力[J].土木工程学报,2012,45(1):23-29.
LI Xiang,GU Xianglin.Bending bearing capacity of low strength reinforced concrete beams strengthened with carbon fiber composite sheets[J].China Civil Engineering Journal,2012,45(1):23-29.
[17]ABABNEH A N,AL-ROUSAN R Z,GHAITH I M N.Experimental study on anchoring of FRP-strengthened concrete beams[J].Structures,2020,23:26-33.
[18]CHEN W S,PHAM T,SICHEMBE H,et al.Experimental study of flexural behaviour of RC beams strengthened by longitudinal and U-shaped basalt FRP sheet[J].Composites Part B-Engineering,2018,134:114-126.
[19]陈爱玖,韩小燕,杨 粉,等.预应力碳纤维布加固钢筋再生混凝土梁受弯承载力研究[J].土木工程学报,2018,51(11):104-112.
CHEN Aijiu,HAN Xiaoyan,YANG Fen,et al.Study on flexural capacity of reinforced recycled concrete beams strengthened with prestressed CFRP sheets[J].China Civil Engineering Journal,2018,51(11):104-112.
[20]混凝土物理力学性能试验方法标准:GB/T 50081—2019[S].北京:中国建筑工业出版社,2019.
Standard for test methods of concrete physical and mechanical properties:GB/T 50081—2019[S].Beijing:China Architecture & Building Press,2019.
[21]混凝土结构设计规范:GB 50010—2010[S].北京:中国建筑工业出版社,2011.
Code for design of concrete structures:GB 50010—2010[S].Beijing:China Architecture & Building Press,2011.
[22]混凝土结构试验方法标准:GB/T 50152—2012[S].北京:中国建筑工业出版社,2012.
Standard for test method of concrete structures:GB/T 50152—2012[S].Beijing:China Architecture & Building Press,2012.
[23]Guide for the design and construction of externally bonded FRP systems for strengthening concrete structures:ACI 440.2R-2017[S].Farmington Hills:American Concrete Institute,2017.
[24]Externally bonded FRP reinforcement for RC structures:bulletin 14[S].Lausanne:CEB-FIP,2001.
[25]Design guidance for strengthening concrete structures using fibre composites materials:TR55[S].Berkshire:British Cement Association,2012.
[26]再生混凝土结构技术标准:JGJ/T 443—2018[S].北京:中国建筑工业出版社,2018.
Technical standard for recycled concrete structures:JGJ/T 443—2018[S].Beijing:China Architecture & Building Press,2018.
[27]混凝土结构加固设计规范:GB 50367—2006[S].北京:中国建筑工业出版社,2006.
Design code for strengthening concrete structure:GB 50367—2006[S].Beijing:China Architecture & Building Press,2006.

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Last Update: 2024-09-30